<template>
    <div>
        <!--面包屑导航区-->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区-->
        <el-card>
            <!--提示区域-->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!--步骤条区域 active="0"激活项,重要 - 0的目的是将字符串转为数字-->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            
            <!--tab栏区域-->
            <!--要和上面步骤条保持联动，需要下面的v-model和name属性-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <!--beforeTabLeave方法，检测标签栏切换，并做出判断，进行阻止标签页切换-->
            <el-tabs :tab-position="'left'" v-model="activeIndex"
                     :before-leave="beforeTabLeave" @tab-click="tabCliked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类">
                        <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange"></el-cascader>
                    </el-form-item>
                    
                </el-tab-pane>
                
                <el-tab-pane label="商品参数" name="1">
                    <!--渲染表单item项-->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                     :key="item.attr_id">
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                                  :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <!--图片上传-->
                <el-tab-pane label="商品图片" name="3">
                    <!--action图片上传到后台的地址，要写完整路径-->
                    <!--list-type指定组件呈现方式-->
                    <!--:headers内置请求不带请求头，无法得到token，因此要加他-->
                    <!--:on-preview预览事件-->
                    <el-upload
                            :action="uploadUrl"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件</div>
                    </el-upload>
                    
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!--富文本编辑器-->
                    <quill-editor v-model="addForm.goods_introduce">
                    </quill-editor>
                    
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
        </el-card>
        <!--图片预览-->
        <el-dialog
                title="图片预览"
                :visible.sync="previewVisible"
                width="50%">
            <img :src="previewPath" alt="" class="previewImg">
            
        </el-dialog>
    </div>
</template>

<script>
  import _ from 'lodash'
  
  export default {
    name: 'Add',
    data(){
      return{
        //第一个被激活项
        activeIndex:'0',
        //添加商品的表单数据项
        addForm:{
          goods_name:'',
          goods_price:0,
          goods_weight:0,
          goods_number:0,
          //商品所属的分类数组
          goods_cat:[],
          //图片路径数组
          pics:[],
          //商品详情
          goods_introduce:'',
          attrs:[]
        },
        //表单规则
        addFormRules:{
          goods_name:{required:true,message:'请输入商品名称',trigger:'blur'},
          goods_price:{required:true,message:'请输入商品价格',trigger:'blur'},
          goods_weight:{required:true,message:'请输入商品重量',trigger:'blur'},
          goods_number:{required:true,message:'请输入商品数量',trigger:'blur'},
        },
        //商品分类列表
        catelist:[],
        //级联选择器
        cateProps:{
          label:'cat_name',
          value:'cat_id',
          children:'children'
        },
        //动态参数列表数据，第二个tab栏数据
        manyTableData:[],
        //静态属性列表数据
        onlyTableData:[],
        //上传的url地址
        uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
        //图片上传手动指定请求头
        headerObj:{
          Authorization:window.sessionStorage.getItem('token')
        },
        previewPath:'',
        previewVisible:false,
       
      }
    },
    methods:{
      getCateList(){
        this.$http.get('categories')
          .then(res => {
            // console.log(res.data)
            if (res.data.meta.status !== 200) {
            return   this.$message.error("获取商品分类失败")
            }
            this.catelist = res.data.data
            this.$message.success("获取商品分类成功")
            // this.total = res.data.data.total
            // console.log(this.catelist)
          })
      },
      //级联选择器对应的函数
      handleChange() {
        console.log(this.addForm.goods_cat)
        if (this.addForm.goods_cat.length !==3) {
          //只允许选择三级分类
          this.addForm.goods_cat = []
          this.$message.error('请选择三级分类')
        }
      },
      //检测标签页切换时做出反应
      beforeTabLeave(activeName,oldActiveName) {
        if (oldActiveName === '0' && this.addForm.goods_cat.length !==3) {
          this.$message.error('请选择商品分类')
          return false
        }
      },
      //点击tab栏标签时触发
      tabCliked() {
        // console.log(this.activeIndex)
        if(this.activeIndex === '1') {
          this.$http.get(`categories/${this.cateId}/attributes`,
            {params:{sel:'many'}})
          .then(res => {
            if (res.data.meta.status !== 200) {
              this.$message.error('获取动态参数列表失败')
            }
            console.log(res.data.data)
            
            //将用逗号分割的字符串转为用空格分隔的数组
            res.data.data.forEach(item => {
             item.attr_vals =  item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            
            this.manyTableData = res.data.data
            // console.log(this.manyTableData)
          })
        }else if (this.activeIndex === '2') {
          this.$http.get(`categories/${this.cateId}/attributes`,
            {params:{sel:'only'}})
            .then(res => {
              if (res.data.meta.status !== 200) {
                this.$message.error('获取静态参数列表失败')
              }
              console.log(res.data.data)
              
              this.onlyTableData = res.data.data
            })
        }
      },
      //处理图片预览效果
      handlePreview(file) {
        console.log(file)
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      //处理图片移除效果
      handleRemove(file) {
        console.log(file)
        const filePath = file.response.data.tmp_path
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        this.addForm.pics.splice(i,1)
        console.log(this.addForm)
      },
      //监听图片上传成功
      handleSuccess(res) {
        console.log(res)
        const picInfo = {pic:res.data.tmp_path}
        this.addForm.pics.push(picInfo)
        console.log(this.addForm)
      },
      //添加商品
      add() {
        console.log(this.addForm)
        this.$refs.addFormRef.validate(valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项')
          }
          //执行添加的业务逻辑
          //先用lodash将addForm深拷贝一份
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          console.log(form)
          //处理动态参数和静态属性
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,
              attr_value : item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,
              attr_value : item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
            form.attrs = this.addForm.attrs
            // console.log(form)
          })
          //发起请求添加商品，商品名称唯一
          this.$http.post('goods',form)
          .then(res => {
            console.log(res)
            if (res.data.meta.status !== 201) {
              return this.$message.error('添加商品失败')
            }
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
          })
          
        })
      }
    },
    mounted () {
        this.getCateList()
    },
    computed:{
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          //返回第三级分类的id
          return this.addForm.goods_cat[2]
        }
        return null;
      }
    }
  }
</script>

<style scoped>

</style>
